... ensures sufficient overlap to prevent premature wear of the matrix. Surface-Set Diamond Bits are set with a ... sufficient overlap to prevent premature wear of the matrix.1,Surface-Set diamond bits are primarily recommended ... ,EWT,AWT,BWT,NWT,HWT(Single Tube/Double Tube)WG SeriesEWG,AWG,BWG,NWG,HWG(Single Tube ... /Double Tube)WM SeriesEWM,AWM,BWM,NWMT2/T6SeriesT256, ...